Knobs



tife length of the s10ping outer edge surface 16 and, at one end, is cut uSh With the Small diameter end of body poltion lz, as at 18, vvhile the other end of the projection 17 XtendS at least to the peripheral edge of the skirt 13- The ntire coTe 11 f tlle knob l0, With the exception of tlle back Ol' under Surface 19 0f the Skirt l3, vvhich Surface i8 poliShed, and the SenTi-cy1indrical Surface of the pr0jection l7, is enclosed 'by a coating 20 (Fig 2) (f light Teecting mterial SO that any light admitted to the lighttransmitting core ll through the polished Surface 19 iS Teected back into the core Wherever such light inpingeS against the Surface of the core covered by [he coating- 2()- The Coating 0 may be formed 0f a t1ans lucent, 1ight c010red, for example, vvhite, material, Such as, Inaterials of the class of olyviny1 0r viny1 resins, f(r exalnple, polyviny1 chride, viny1 chIorideCetate CG p0lymer8, p0lyvinylidene chloride, and Viny1 chloridevinylidene ch10ride c0p01ymers, for a purpose hereinafter indicated in de tail. A dark colored, referbly black, 0paque coating zl (Fig' 2) is Superposed on the coating 0 and may have a I1Tatte finish S0 that the 0Llter surface ()f'he knob vvill be T1()1-1'ei lective 0r of low Specular gloss The 0paque coating 21 nlay be f()r'med ()f any of the materials mentioned in connection wil tle coating 20, and both coatings may be applied in the fornl of paints which are Successively brushed, Sprayed or 0therwise ap plied to the core ll` The semi-cy1indrical projection l7, including the end Surface 18 there0f, is Covered by an opaque White coating zz which contrasts Sharpy with the dark, preferably black, coloration of the ren1ainder of the visible Surface 0f tle knob fornTed by the coating zl and thereby deneS the index of the knob vhen th`e latter is viewed in day- Iight or other an1bient i1l1inati011. I f the light reecting coating 2 iS als0 0 aque, the coating zz on the projection 17 can be applied at the Sanle tixne as the coating 20 and merely form an exp08ed extension of the latter cOting' In order to dne the index 0f the kndb 10 When the latter is internally il111n1inated by light adnlitted through the bare polished Surface 19 the coating 22 iS interrupted along a Slender elongated 2trea to forrn a Slot 23 (Figs( 1 Z and 4) extending centrally along the projection 17 fr0m end to end of the latter and through Vhich the underying lighttranSnitting n1aterial of the cofe ll is exposed Thus, 1ight will escape ^froi11 the core ll through the slot 23 to brightly illuminate the latter Further, an opening 24 (Figs l, z and S) iS preferably forned in the portion of coating zz covering end face 18 0f the r0jection 17 and there also exposes the underlying light-trans[nitting Inaterial of the-core S0 that light Will escape fr()m the core ll thr()llgh the Open ing z4 vhen the coating 20 is fortned 0f a translucent Inate ial, as mentioned above, identifying markings and the Hke capable of being illuminated by light adln-itted to the core ll can be denned on the snlall diameter end of the body pomon lz Or elsewhere on the knob, by interruping the outer opaque coating zl in a Suitable )attern S0 that the exp0sed underlying portions of the coating z0 dene the desired markings, By reason of the contrast betvveen the exp0sed portions of the White coating 20 and the Surrounding portions bf the black outer coating(z1, vhich forn1 a background, the markings defined by the exposed portions of coating z0 Kill be clearly visible in daylight of other ambient illumination and, When light is adn1itted to the core l1, Such light transulurninateshe transucent c0atng 20 at the exposed portions of the latter to provide glare-free il111minati0n of the cofre- Sponding ma[kings.

'I1order t0 adInit light to the core ll through the Surface 19 0 the 'latter, the knob -10 is refe1bly as- Sociated yvith an internally illuminated panel, fcr Zex ample, a panel T)f the type tht is described and illustrated in United states Letters Patent NO' 2 18 7\26 issued August 1, 1950 to Charles N. Shlenker. AS Seen in Fig' Z, a anel of tha type, generally identied by the reference nufneral z5, includes a light-trans[nitting Core z, a vvhite translucent layer 27 Superp0sed ()n at least the front surface 0f the core 25, and a black opaque layer z8 Superposed on the ]ayer z7 and having openings 29 therein to expose underlying p0ftions of the translucent layer in the form of desired markings, indicia oi the like, and S0 that, When light iS admitted t0 the core z from a Suitable source (not Shovn), the exposed portions of the translucent layer z7 are tra1sil[11ninated T0 clearly dene the openings z forming the nlarkings and the like.

AS seen in Fig 2 the knob 10 has an axial, blind borc 30 0pening at the center of the Sulface l and accommodating a metal bushing 31 Which has a press fit Within the bore 30' At least one Set screw 32 iS threaded into radially aligned, tapped bores in the core ll and bushing 31 0f the kndb and acts to Secure the latter on a Shaft 33 extending from the device 34 t() be contr011ed 0r actuated by the knob. The device 34 is suitbly Supported in back of 'the panel 25 a11(l the Shaft 33 extends f0rwardly through a Suitable opening 35 provided in the panel S0 that the free end Of he Shaft can be received in the bushing 31. In order to admit light int0 the core 11 0f knob 10 from the panel z5, the layers 27 and z8 0f the latter are removed in an annlllar area 36 covered by the Skirt 13 0f the knob, Whereby light escapes from the core z6 at the area 36 and there enters the cole ll of tlle knob through the p01ished Surface 19' The cOnguratiOn of the knob 10, Specicaly the provision of the thick bar 14 thereon, permits the irm grasp ing Of the knob t0 facilitate the turning of the latter even when fhe knob is used 'to control or actuate a hard t0 turn device, for example, a detent Switch, Valve or the like /lthough the knob 10 can be firnly grasped, the connguration thereof iS Such that its )()Sition, and hence the condifion 0f the Telated device 34, can be readily determined by viewing 'the relationship of the index of 'the knob to a Scale or calibration dened on the panel z5 by the openings z 'iI1 the layer 28 0f the panel, even When theknob iS viewed a10ng lineS forming Substantial angle3 Vvith the axis of the kn0b' since the indeX dening pTO jection 17 extends to the periphery 0f the skirt 13 and S, therefore, C10Sely adjacent to the Surface of the panel 25, `there is no possibility that an error may arise in readi 1g the relationShip of fhe indeX to the Scale or calibra Tlo11(by reason of parallax. Further, the definition of the lndex by the projection 17 which is Taised from the in Clined Sul face 16 ensures that, fol most rotated positions of the knob and f0 n10st 10cations froIn Which the knob may be viewed, the 'length of the projecti011 17 Will be Visible t0 the viewer and not obscured by the frtlst0- conical bodyp0fIion 12 df the knob, II0Wever in those f :v poSiti()nS Ofthe kIlob Whefe the length of the projectlon 17 'is not visible, for exan1ple, 'as illustrated in Fig. VYhen the index is located at the side 0f the knob v/hich 1S dlame...cauy away from the viewer, the end face 18 0f the`projection and the opening 24 vVill Still be in view t0 cleafly dene 'the p0sition of the knob under cither Imbient ill11n1ination or intetnal inumination, respective Although the knob 10 described in connection With Flgs 1 'to inclusive, has a vvhite Opaque coating zz on the projection 17 todene the index in daylight and the l0t 3 and opening 24 dene the index under intcrnal 1lluI lnat0n, as -Seen in Fig 6, a knob embodying this inyentlon ca1' have a White, translucent coating zz(z coverlng the projection l7 'there0f and contrasting With the black,*0paque outer:laye1 2l Which is Superposed on the `enecting, preferbly tlanslllcent, Vhite layer z0 covermg the cofe ll(z When the knob of Fig. 6 is viewed in d ylght, the white translucent Coating zz defines the index, and'when light is admitted t0 the core ll(z in the manner described in connection vvith the knob of Figs. 1- to the [T2(IS11...6]1t `coating zz(z is 'tra1]sillun1inated to Said elonga{ed opening 'to dene the index under internal illt1r1i1ati()1' 7. A knob according t0 claim 6; 'vherein said coating covering Said Projection has a further opening 'facing axi2flly at the end of said projection adjacent Said small end of the body portion and through which light can also escape from said core to define the location of the index Vhen the knob is Viewed fr0m 10cati011s at the Side of the knob diametrically opposed to said rOieciOn 8] A knob acc0tding to claim S; Wherein said coating covering the projection is trailslucent SO that light ad- Initted t0 said core vvill transi11111ninate said translucent coating and thereby provide glare-free nlumination at said index dening pr0jection 9' A knob according to claim S; Wherein said first UNITED STATES PATENTS Sullivan ]uly 1, 19z 1`Ieugass Iune 29 l94 

